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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 1,881,090 $ 1,823,266
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 497,985 494,134
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 976,258 907,803
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 299,209 299,876
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 299,209 299,876
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 107,638 121,453
Pass    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 1,841,168 1,795,367
Pass | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 488,395 491,531
Pass | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 948,854 886,849
Pass | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 296,565 295,758
Pass | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 107,354 121,229
Special Mention    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 4,615 10,160
Special Mention | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 1,971 869
Special Mention | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 2,644 8,934
Special Mention | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net   357
Substandard    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 35,307 17,739
Substandard | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 7,619 1,734
Substandard | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 24,760 12,020
Substandard | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 2,644 3,761
Substandard | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 284 $ 224